Machine for sewing with a knot-stitch.



No. GQILISB. Patented Dec. 3|, |90I. C. H. DANA, In.

MACHINE FOR SEWING WITH A KNT STITCH.

I (Application led Nov. 15, 1900.)

(No Model.) 4 Sheets-Sheat l.

wIIIIII-f Nn. 69am, Patented nec. 3|, |901, c. H. DAMA, In. MACHINE FUR SEWING WITH A KNOT STITCH.

(Application filed Nov. 15, 1900.)

4 Sheets-Sheet 2.

(No Model.)

6476667265 7.55am J; 55

J f J 7M 7 ses:

@ya v9/Maf Patented Dec. 3|, 190|. u

c. H. DAMA, 1n. MACHINE FOR SEWING WITH A KNUT STITCH.

(Application filed Nov. l5, 1900.)

4 Sheets-Sheet 3.

(Nu Model.)

Nu. GQILIBG. Patented Dec. 3|, I90I, c. H. DAMA, 1n.

IIIACHINE FUR SEWING WITH A KNOT STITCH.

(Application med Nov. 15, 1900.1 (No Model.) 4 Sheets-Sheet 4.

UNrTeo STATES PATHNT OFFICE.

CHARLES, H. DANA, JR., OF VEST LEBANON, NEW HAMPSHIRE.

MACHINE FOR SEWING WITH A KNOT-STITCH.

TSEEGEFCATEON forming part of Letters Patent N o. 690,136, dated December 31, 1901.

Application filed November 15, 1900. Serial No. 36,543. (No model.)

To all 10.72.0711, it may concern:

Be it known that I, CHARLES H. DANA,'J1-., a citizen of the United States, residing at fest Lebanon, county of Grafton, State of New Hampshire, have invented an Improvement in Machines for Sewing with a Knot-Stitch, of which the following description, in connection with the accompanying drawings, is a specilcation, like characters on the drawings representing like parts. t

This invention has for its object the production of a novel sewing-machine by which to unite layers of material at suitable distances apart by a knot-stitch.

My novel machine is applicable, among other things, to book and pamphlet sewing, the manufacture of quilts and coverlets, and other work wherein it is desired to tack or unite at intervals layers of material.

The mechanism herein to be described contains devices for tying on the under side of the material a knot during each full rotation of the driving-shaft, and then the thread is cut and the material is fed for the distance desired between one and the next knot. A portion of the thread used in making the knot is held at one side of the material-viz., as herein represented the under side thereofwhile the knot is being tied.

Figure 1 in side elevation represents a sewing-machine showing my improvements in one of the best forms now known to me. Fig. 2 is a front elevation of the same. Fig. 3 is a detail of the stitch-forming mechanism under the work-support. Fig. 4 represents a top View of the head of the machine. Fig. 5 is a section on the line so, Fig. 1, looking to the right. Figs. 6, 7, 8, t), and 10 represent different positions of the stitch-forming mechanism from the starting to the completion of a knot-stitch. Fig. 1()a is a diagram showing the position of the needle, the looper, and the nippers to correspond with the position of said parts in Fig. 7. Fig. 1O`n shows the nippers changed in position to cross the thread between the eye of the needle and the looper. Fig. 1l is a plan view of the vthread clamping and cutting mechanism. Fig. 12 shows a stitch in its formation. Fig. 13 shows the stitch completed. Fig. 14 is a detail in plan View showing the beak, the nippers, the needle, and looper in the position Fig. G; and

end an arm A5, which carries a suitable crankpin 2, (see Fig. 2,) which enters a cam-slot 3 in the shank of a looper A, secured to a shaft A7, extended through a suitable bearing A8, fixed in the framework.

The shaft A7 in the bearing A8 is provided (see Figrl) with a pin or projection 4E, which enters a slot 5, formed in the wall of the bearing, so that as the looper-shaft Aiis rocked it is by thc pin-and-slot connection reciproca-ted somewhat, that the looper may move transversely with relation to the vertical plane in which the needle of the stitch-forming mechanism reciprocates in the making of the stitch, as will be described.

The main shaft A is provided with a suitable pulley, as B, which in practice will be a clutch-pulley, which may be engaged and rotated preferably one full rotation to enable the ncedle-barof the stitch-forming mechanism to be reciprocated and have imparted to it two full strokes, at which time the main shaft A will be automatically stopped with the needle out of the material. I have not herein deemed it necessary to illustrate this class of clutch-pulley and stopping device,as the same is commonly employed in machines forinserting metallic fastenings and driving pegs for boot and shoe work, and I may employ any of 'the usual forms of devices for starting and stopping the stitch forming mechanism automatically at an established predetermined time.

The wheel B is herein represented as provided with a cam-groove B', the shape of which is shown in Fig. 2, said groove receiving a roller or other stud B2, carried by an arm B3, fast on a needle-bar-actuating shaft B, said cam, as hereinillustrated, impartinga rocking movement to the shaft B4. The shaft B1 is provided at its front end with an IOC) arm B5, (shown in Figs. l and 2,) said arm having joined toits end a link B6, which has at its lower end a hole to embrace a studserew extended baekwardly from the needlebar B7. This needle-bar is fitted to be reciprocated in a groove formed in a movable head or frame B8, pivoted at B9 (see dotted lines, Fig. 2) to the overhanging arm B10, forming part of the framework of thevmaehine. The needle-bar has connected to its lower end in suitable manner an eye-pointed needle a, and the needle-bar also has connected with it and extended through a slot 6 in the movable head a stud 7, which constitutes a pullo and also a takenp to aid in drawing the threads in the completion of the stitch by the tying of the knot.

The machine herein to be described uses one thread, taken from a suitable spool, (represented at 1312,) it being led thence through a suitable thread-guide at', xed to the head of the machine,and thence between suitable tension-disks a2 (see Fig. 2) to and through a guide-eye co3 through the pull-oft` and takeup, and thence to the eye of the needle. At times during the formation of the knot-stitch it is desirable that the thread be free of tension, and this is especially desirable during the first descent of the needle a in the formation ofthe knot, and during this time with the parts in the position Fig. 2 the tensiondisks 01,2 are relieved from the pressure of the usual spring a1 by means of a pla'te (t5, connected with the movable head and having a projection which overlaps the upper end of the head, said spring a4 resting upon the free end of the plate c5, and consequently when the swinging head is in the position Fig. 2 it takes all the pressure of the spring a4, leaving the thread free to be drawnthrough the needle in the making of the stitch. When the needle makes the second down thrust in the formation of the stitch, at which time the knot is to be tied, the movable head occupies such position that the needle-bar stands in a substantially vertical plane,and at such time the sheets 'may be stitched in the line ot' fold.

The machine also has a presser-foot C, it in the for-m in which l have herein chosen to illustrate it being composed of a plate suitablyattached to a sliding frame C2, embracin-g a portion of the head of the machine, said frame having imparted to i-t a vertical movement at suitable times by a cam C3 on the main shaft-,said cam acting upon a suitable project-ion, as 10, ot' said frame. This frame may be moved in opposition to the cam C3, in usual manner common to presser-feet, by a spring; The movable frame has a second groove substantially parallel with the groove in which the needle-bar B7 slides, said second groove receivingin it aslide-bar D, which, as herein shown, is jointed loosely at its lower end at 12 with ears 13, connected with the lower memberof athread-clamp D', said member being pivoted at D2 on the presser-foot C and having a needle hole or slot 14. 'The member D has pivoted upon it at D3 a coperating thread-clamping member D4, which has jointed to its inner end a lilik D5, in turn pivoted at one end to the presser-foot, so that as the thread-clamp is moved in the direction of the arrow upon it in Fig. 11 with and by the movable head or frame through the bar D the free end of the upper clamping member D4 crosses the slot 14 and clamps the needle-thread extended therethrough from the eye of the elevated needle to the material. The needle-thread is clamped after the'rise of the needle, it having made a second ascent, at which time said thread, it having been made into a knot-stitch, is being cut ot at the upper side of the work by a thread-cutter C4, composed of a plate having a cutting edge 16 and pivoted at 17 on the presser-foot, said plate having a suitable pin or projection 18, which enters a slot 19 in the thread-clamping member D1, said thread-cutter therefore in this present instance of my invention deriving its movement from the thread-clamping device. The end ofthe thread is held by t-he clamp when the machine is at rest and during the needles first descent for the production of a knot-stitch. The movable frame BS isfthen swung toward its position for the second or final descent of the needle, it imparting motion to the clamp in the same direction and opening said clamp, and the thread is released therefrom, this being done after the end ot' the thread held by the cla-mp has been grasped below the material by a nipper to be described;

The movable frame BS is actuated about its fulcrum B9 by means of asuitable cam D, fast on the main shaft, said cam contacting with the inner sides ot lugs D1, located at the inner side of the movable frame. The bar D slidesvertically in the groove made for its reception in the movable head as the presserfoot is raised and lowered, and it also slides somewhat in said groove while the movable head is moved laterally to put the needle in position to penetrate the material at a distance from the first penetration equal -to the length of the knot-stitch, the said thrusts being separated for any desired distance, according to the quantity of material it is desired to embrace by each stitch made inthe material.

The wheel B has a second cam-groove D8, (see Fig. 5,) which receives a roller-stud D9, herein represented as carried by a link D10, jointed at its lower end toan arm, D10X, having its fulcrum at D12 on a projection 'from the framework, said link in the form in which l have herein chosen to illustrate my invention having attached to it a radius-bar D13,

IOO

IIC

jointed at one end to an arm D11, fast on a rock-shaft D15, extended to the front of the machine, (see Fig. 2,) said shaft having connected to it by a suitable set-screw 20 the carrier F., provided with one member 21 of a beak, the other member being a movable jaw 22, pivoted at 23 on said carrierE and having at its opposite end a roller or other stud 24, (see Fig. 6,) which is maintained normally in contact with an edge 25 of a cam E by a suitable spring 30,(partially shown in Fig. 2,) said cam pivotally mounted at 26 on the carrier E, constituting a beak-actuator, and having a notch 27,which engages a pin 2S, fixed to the frame A, so that when the shaft D12 is rocked said carrier is moved, as will be described, and the beak is moved from the position Fig. 6 into the various positions designated in Figs. 7, S, and 9.

The carrier E has pivoted upon it at 31 a pair of nippers composed of two members b, b', the memberb having an eye h2, (see Fig 3,) open at its under side for the ready entrance therein of the needle-thread at a point between the clamp or material and the eye of the needle. The member b is provided at its lower end with a roller or other stud b3, (shown by dotted lines in Fig. 2 and by full lines in Fig. 3,) which enters a cam-slot 32 in a cam h4, carried by a sleeve b5, surrounding the shaft D15, said sleeve at its opposite end (see Fig. 5) having connected to it, as herein represented, in an adjustable manner, by suitable set-screws b, an arm bi, to which in turn is jointed a link if, represented as attached to the link a2, before described. The member b of the nipper has a slot (see Fig. 1) which receives a stud 33, extended `from the member b, said stud constituting a stop to contact with the inner end of the slot in the member b and move the latte'r member with the member b after a part of the active side of the loop of needle-thread has been grasped by the nippers b and h, said nippers after having received the needle-thread, as in Figs. 7 and 10a, being moved into position Fig. 10b to thereby draw one-half of the loop into a position to cross the other half near the part of the loop held on the looper. A suitable spring, as 31, connected with the member b' and herein represented as surrounding the stud 31, acts normally to cause the upper end of the member b to retain its normal stationary position. (Shown in Fig. 1.)

Operation: As has been hereinbefore stated, it will be remembered that the machine is stopped automatically after the completion of each stitch. Fig. 2 shows the position ofthe parts when stopped and ready to be again started, the end of the needle-thread being held by the clamp. The operator will place the material to be stitched upon the work-support and will then through a suitable device of usual construction start the main shaft,and with the presser-foot resting upon the upper surface of the material the needle will be moved downwardly from the position Fig. 2

through the material into the position Fig. 6, and the needle will be elevated slightly' to throw out a loop of sufficient size to be entered by the looper A1", and the looper having caught the loop of needle-thread the upward movement of the needle is temporarily suspended while the looper is moved to the right from the position Fig. 6, taking the loop with it into the position Fig. 7. The active side of the loop of needle-thread, or that side between the eye of the needle and the material, under the action of the looper 31 is drawn into the eye b2 ofthe nipper member b, which at such time stands in its normal or threadreceiving position to receive* the thread near its end, the end of such thread being held, as stated, above the material by the threadclamp, composed of the members D' and D4. As soon as the thread engaged by the looper is moved thereby into the eye of the nipper memberb (see Fig. 10) the cam 32inits movement moves the member Zi in the direction of the arrow near it in Figs. 1 and 3, causing the thread to be nipped between the members b and b', the nippers in their movement from the position Fig. 10 into the position Fig. 1()b crossing the part of the thread held by it over the thread between the eye of the needle and the looper. The nippers b and b hold the thread iirmly, while the hold upon the end of the thread by the clamp D D1 is so light that the end of the thread is readily pulled out of the clamp by the motion ofthe nippers soon after the nippers have grasped the thread. The thread having been put into the nipper by the movement of the looper from the position Fig. 6 to the position Fig. 7 and the nipper having grasped the thread, the needle starts upwardly, and the looper continues its movement to the right, as from the position Fig. 7 into the position Fig. 8, taking with it and enlarging the loop of needle-thread, and during this rising movement of the needle the thread leading from the eye of the needle to the rear side of the looper and held by the nippers is carried across that part of the loop which extends from the outer side of the looper to the nippers,this position of the thread being represented in Figs. 10b and 15. The needle continues to rise from the material,and thereafter the movable frame and needle are swung laterally to the right from the position Figs. 6 and 7, and the looper is also moved to the right into the position Fig. 8 for a dist-ance equal to the length of the knot-stitch to be made, the parts stopping in the position represented in Figs. 8 and 15, where it will be seen that the end of the needle-thread is yet held by the nippers and that the needle-thread held by the looper has had put into it a twist, leaving a loop open in the path of the needle, which as the latter again descends through the material at its second descent passes from the position Fig. 8 into the position Fig. 9, entering the loop formed in part of the loop of needle-thread previously made and yet held by the looper. While the needle descends IOO IIO

through the material in the position Figs. 2 and 6, the tensionon the needle-thread :is released, and said tension remains in its inoperative position while the needle rises and While the needle and hook are moving to the right to define the length of the knotstitch, thus making it possible to draw the thread heldat one end by the nipper freely through the eye of the needle from the threadsupply, said thread being utilized in the formation of the knot to be described. During the movement of the looper and needle to the right and while they take thread for the formation of the stitch the nippers holding the thread near its end are started to the right, so that it follows the looper. The looper having reached the end of its stroke is stopped and theneedle is again thrust through the material and through the loop of thread held by the looper, and at this time the nippers are moved to cross the plane in which the needle reeiprocates in frontof the beak, said nippers delivering the end of the thread then held by itto. the beak, it standing (see Fig. 9) in the loop of' needle-thread bulgedfrom the eye of the needle at its second descent, and having passed through said loop is Aopened by or .through the nipper-cam E, so that the beak catches `and embraces the end of the thread held. by the nipper. The nipper delivers the thread tothe beak while the latter is held .open by the cam, as in Fig. 9, andthe beak. having grasped and taken the end of the thread from the nipper, as in Fig. 9., is moved .backwardl'y to the left, pulling theend of the thread engaged by itthrough the loop ofneedle-thread yet bulged fro-m the eye Vof the needle and formed atts second descent. During this movement of thebeak to draw the Iend of the needle-.thread through the secl ond loop formed therein the looper stands substantially still and holds the first loop and the beak approaches the loop buig-ed from the eye .of the needle in order to enter it, the nippers at the same time holding the end of the thread, as shown in Fig. 10a. The beak and the connected nippers approach the needle together andthe n.ipper is moved from ythe position Fig. 10@ intothe position Fig. l0b to cross one part of the loop of thread held by the looper across the other part, and when the beak has been moved from the posi-tion Fig. 8 farenough to enter the loop bulged from the eye of the needle (see Fig. 9) the nipper holding the end of the thread has so changed the angle of the thread connected with the material as Ato cross the thread diagonally across the vertical plane in which the needle moves, putting the thread just behind the point .of theA beak, and in this posit-ion the nippers holding the thread are moved across the path of movement of the beak at a point just inadvance of the point of the bea-k, the nippers thus putting the end of the thread held by them in the beak, when the beak is closed upon said thread and the nippers are opened by the Dipper-cam 32 to release the thread end, so that said end may thereafter be held vand controlled by th-e beak. The beak'in engagementwith the needlethread is moved from the position Fig. 9 into the position Fig. 10 while the. needle rises from the material, the beak and the needle coacting to draw the thread taut against both the upper and under side of the material. During the rising of the needle-bar, as described, the needle-thread extended over the ,pull-off 7 is acted upon to not only take up the slack thread caused by the discharge of the loop of needle-thread from the beak, but also someV thread is drawn from the threadsupply. The beak is moved in suchy time that it draws the end of the needle-th read through the loop of needle-thread extended fromthe needle at its second descent, and the movement of the beak is. retarded while the looper starts toward the beak to give up quickly the loop held by it, the beak holding onto the end vot the thread throughout its final movement and drawing upon the thread taking up the loopy cast from the looper, causing the thread to be tied into a close firm knot, which under no condi-tions has any tendency toslii-p.. The tying of the knot completes the stitch, andthe thread is .then cutoff as the movable head or fram-e starts to move from lthe position Fig. l0 into the position Fig... 6, the,Y edge of the thread-cutter at such time being moved to'- ward the right, viewing Fig. 11, to cut the thread between itself and aV notch 40. in the edgeof the presser-foot. Asthe thread-.clamp is moved from the position Fig. l0 into the positions Figs. 6 and 1l the. member D4of the cla-mpcrosses the slit 14 in .the member D' and clamps the thread, holding it until another stitch is to be made. The thread-cntter acts to cut the thread between. the threadclamp and the material after the n-eedzle rises,

-it having made the finishing thrust for the knot-stitch, leavin-g the end of theY thread held in the clamp preparatory to making another stitch.. The mate-rial, a knot-stitch having been made in it, is moved by hand while the presser-foot is elevated for a dis-tance suincient to make the next stitch at .the point d'esired. Du ring the completion of the knot by the movement of the beak in engagement with the end of rthe thread 4andvby the. rising of the needle the looper yet holds the loop 'of thread taken from the eye of-t'heneedle at'its first descent and prevents the said loop from being closed upon the thread to thus obstruct the drawing kof the threads when tying. the knot until after the thread has been laid firmly against the urp-per and under sides of the material, and the threads having been drawn closely to the upper and under sides of the material the looper retires from the loop of thread held by it. The last step in the knot-tying operation is that of the retirement of the looper from the loop held by it, the looper discharging the thread held by it, while the knot being formed is substantially square, as shown'in Fig. 13, and in this way IIO the knot cannot thereafter resolve itself into a knot which can slip.

This invention is not limited to the exact form of mechanism shown to operate the looper, nipper, and beak, nor to the exact shape shown for said devices, as I may change the shape and construction of the parts and yet have them operate in the manner described to manipulate the thread and tie a knot.

In the claims I may designate the beak as means to draw the free end of the thread of the rst loop through asecond loop of needlethread formed at a second passage ot' the needle through the material.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

l. In a sewing-machine, a work-support, a needle-bar having a thread-carrying needle, means to reciprocate said needle-bar that the needle may penetrate the material, means to move the needle-bar laterally with relation to the material, a normally open nipper located between the looper and material to receive and grasp the loop bulged from the eye of the needle, a looper, means to actuate it to engage said loop of needle-thread and place it between the jaws of the nipper, and means to take the thread from said nipper and draw it through a loop made in the needle-thread below the material at a subsequent descent of the needle to thereby form a knot-stitch.

2. In a sewing-machine, a work-support, a needle-bar having a needle to pass a thread through the material and form a loop therein at one side of said material, a looper to engage said loop, a normally open nipper to receive one side of said loop, means to move the needle and looper laterally while the needle is ont of the material for a distance equal to the length of stitch desired, said looper engaging and holding the loop of needle-thread taken by it until the needle at a second descent enters the loop of thread then held by the looper, and means to pass the end of the thread forming part of the said first-formed loop through a second loop of needle-thread formed at a second thrust of the needle through the material and to draw said thread to complete the tying of a knot therein.

3. In a sewing-machine, a work-support, means to hold the end of the thread, an eyepointed thread-carrying needle, means to operate it that the needle may penetrate the material twice in succession at a distance apart equal to the length of stitch desired, a looper to engage the needle-thread below the material atthe first of said penetrations, and means for crossing the strand of the threadloop held by said looper, the looper holding` said loop of thread to be entered by the needle in its second descent, means to enter the loop thrown out from the eye of the needle at its second descent and engage the end of the thread of the loop formed at the first descent of the needle and draw said end through the loop formed at the second descent of the needle, thereby tying said thread into a knot and completing the stitch.

4. In a sewing-machine, a needle-bar provided with an eye-pointed needle, aworksupport, knot-tying mechanism.comprising means to clamp and hold the free end of the thread above the work-support, a nipper located below the work-support, means to open and close the same, and means located below the material to put the needle-thread near its end in said nippers and while the nippers hold said thread draw itthrough the eye of the needle to form a loop therein of the desired length.

5. In asewing-machine, a work-support, an eye-pointed thread-carrying needle, means to engage and hold the free end of the needlethread at the upperside of the material,means to operate the needle that it may penetrate the material while the free end of the thread is held as described and form a loop of needlethread below the material, a looper located below the material to engage the loop of needle-thread, a thread-nipper, means to operate the looper to place a part of the loop held by it between the jaws of the nipper, and means to close the nipper upon said loop and hold the thread during the formation of a knot-stitch.

6. In a sewing-machine, a work-support, an eye-pointed thread-carrying needle, means to engage the free end of the needle-thread at the upper side of the material, means to operate the needle that it may penetrate the material and leave a loop of needle-thread below the material, a looper, a thread-nipper,means IOC to operate the looper to place the thread held by it in the nipper, means to close the nipper upon and hold the end of the loop of needlethread during the formation of a stitch, means to move the looper and needle while out of the material preparatory to a second descent of the needle through the material for a distance equal to the length of the stitch desired, means to pass through the second loop of needle-thread formed below the material, grasp the end of the needle-thread held by the nippers and draw the same through the second loop of needle-thread to form a knot, means to draw said thread to setthe knot, and means to sever the needle-thread.

7. In a sewing-machine, an eye-pointed thread-carrying needle, means to actuate it, and a thread-clamp to engage and hold the end of the needle-thread prior to the passage of the needle through the material, combined with a nipper located below the material, and with means to engage the loop of needlethread below the material and draw it into said nipper, the latter being then closed upon and holding the needle-thread during the com pletion of the stitch to be made.

S. In a sewing-machine for forming a knotstitch,an eye-pointed thread-carrying needle, means to actuate it to penetrate the material and form a loop below the material, a looper to engage the loop of needle-thread at one side of the needle, thread-nippers located below IIO the material to engage the free end of the loop of thread near the eye of the needle while the needle is below the material, a beak having jaws to enter a second loop of thread thrown out from the eye ofthe needle at a second descent of the needle through the material, and means to actuate the beak to take the end ot' the needle-thread held by the nippers and draw it through said second loop in the needle-thread to complete the knot.

9. In a sewing-machine, a work-support, a needle-bar provided with an eye-pointed needle, means to actuate said needle-bar and needle, an open nipper, a looper located below the material, means to move said looper to put the needle-thread near its end into said open nipper, means to close the nipper to hold the needle-thread while the looper in its further movement in engagement with the needlethread draws thread through the eye of the needle for the formation of a loop, and means to further move said nipper to cross the thread of the loop held by the looper for the entrance therethrough of a needle at a subsequent descent through the material.

10. In a sewing-machine, a work-support, a needle-bar provided with an eye-pointed needle to penetrate the material, means to actuate said needle -bar causing the needle to penetrate the material twice in the production of each knot-stitch, a nipper device to receive and hold the end of the thread extended beyond the eye of the needle below the material at its rst descent, a device to engage "said thread below the material between said .nipper and the eye of the needle to draw through the eye ot' the needle a suicient `quantity of thread and hold it as a loop to be .entered by the needle at a second descent .through the material, and means located below the material to enter the loop of thread thrown from one side of the eye of the needle at a second descent, and engage the thread vnear its end which is held as described, and draw the end of said thread through the loop formed by the needle at its second descent, thus completing a knot.

1l. In asewing-machine, a work-support, a needle-bar provided with an eye-pointed neeesame dle to penetrate the material, means to actu- 5e ate said needle-bar causing the needle to penetrate the material twice in the production of each knot-stitch, a nipper device to receive and hold the end ofthe thread extended beyond the eye of the needle below thematerial at its first descent, a device to engage said thread below the material between said nipper and the eye ofthe needle to draw through the eye of the needle a sufticient quantity ot' thread and hold it as a loop to be entered by the needle at a second descent through the materiahand means located be- Vlow the material to enter the loop of thread thrown from one'sideof the eye of the needle at a second descent and' engage the thread near its end which is held as described, and draw the end of said thread through the loop formed by the needle at its second descent, thus completing a knot, and means to thereafter sever and clamp the end of the thread holding the same while the needle is in its elevated position preparatory to again entering the material for the production of a knotstitch.

l2. In a knot stitch sewing-machine, a work-support, a needle-bar having an eyepointed needle, means to actuate said needlebar, a normally open nipper located below the work-support, means to close it, a looper also located vbelow the material, and means to actuate it to engage the loop of needlethread between the material and. needle and in the commencement of its movement place a part of said loop in said nippers, the latter being then closed on the needle-thread and holding lthe same while the looper in its further movement in engagement with the needle-thread draws the same through the needle and forms a loop holding the same for the entrance of the needle therethrough at a subsequent descent through the material.

In testimony whereof I have signed my vname to this specication in the presence of two subscribing witnesses.

CHAS. H. DANA, JR. Witnesses:

EDWARD C. FULTON, GEO. W. GILMAN. 

